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Commons Attributes example source code file (AttributeValidatorTask.java)
This example Commons Attributes source code file (AttributeValidatorTask.java) is included in the DevDaily.com
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Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.
The Commons Attributes AttributeValidatorTask.java source code
/*
* Copyright 2003-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.attributes.validation;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.PrintStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import org.apache.commons.attributes.AttributeRepositoryClass;
import org.apache.commons.attributes.Attributes;
import org.apache.commons.attributes.AttributeUtil;
import org.apache.commons.attributes.Indexed;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.Path;
/**
* Ant task that validates attributes. Usage:
*
* <pre>
* <taskdef resource="org/apache/commons/attributes/anttasks.properties"/>
*
* <attribute-validator jarFile="myclasses.jar">
* <classpath>
* ...
* </classpath>
* <validator class="my.Validator"/>
* <validator class="my.other.Validator"/>
* </attribute-validator>
* </code>
*
* The task will run the validator(s) with the classes the given jar file.
*/
public class AttributeValidatorTask extends Task {
private File jarFile;
private List classes = new ArrayList ();
private List validators = new ArrayList ();
private Path classPath;
private File baseName;
private boolean inMaven = false;
public static class Validator {
private String className;
public void setClass (String className) {
this.className = className;
}
public String getClassName () {
return className;
}
}
public void setJarfile (File jarFile) {
this.jarFile = jarFile;
}
public void setBaseName (File baseName) {
inMaven = true;
this.baseName = baseName;
}
public Path createClasspath () {
this.classPath = new Path(project);
return classPath;
}
public Validator createValidator () {
Validator validator = new Validator ();
validators.add (validator);
return validator;
}
private static final String SUFFIX = "$__attributeRepository.class";
protected void findJarFile () throws BuildException {
File[] allFiles = baseName.getParentFile ().listFiles ();
if (allFiles == null) {
throw new BuildException ("Unable to find any file with base name " + baseName.getName ()
+ " in " + baseName.getParentFile ().getPath ());
}
long newestDate = 0;
for (int i = 0; i < allFiles.length; i++) {
String name = allFiles[i].getName ();
if (name.startsWith (baseName.getName ()) && name.endsWith (".jar") &&
allFiles[i].lastModified () > newestDate) {
jarFile = allFiles[i];
newestDate = allFiles[i].lastModified ();
}
}
if (jarFile == null) {
throw new BuildException ("Unable to find any file with base name " + baseName.getName ()
+ " in " + baseName.getParentFile ().getPath ());
}
}
public void execute () throws BuildException {
if (inMaven) {
findJarFile ();
}
if (!jarFile.exists ()) {
log ("Can't find " + jarFile.getPath ());
return;
}
try {
log ("Validating attributes in " + jarFile.getPath ());
JarFile jar = new JarFile (jarFile);
try {
Enumeration e = jar.entries ();
while (e.hasMoreElements ()) {
JarEntry entry = (JarEntry) e.nextElement ();
if (!entry.isDirectory ()) {
String className = entry.getName ();
if (className.endsWith (SUFFIX)) {
className = className.replace ('/', '.').replace ('\\', '.').substring (0, className.length () - SUFFIX.length ());
classes.add (className);
}
}
}
} finally {
jar.close ();
}
AntClassLoader cl = new AntClassLoader (this.getClass ().getClassLoader (), project, classPath, true);
try {
cl.addPathElement (jarFile.getPath ());
HashSet classesToValidate = new HashSet ();
Iterator attrs = classes.iterator ();
while (attrs.hasNext ()) {
String className = (String) attrs.next ();
Class clazz = cl.loadClass (className);
classesToValidate.add (clazz);
}
Iterator iter = validators.iterator ();
while (iter.hasNext ()) {
Validator validator = (Validator) iter.next ();
Class validatorClass = cl.loadClass (validator.getClassName ());
AttributeValidator attrValidator = (AttributeValidator) validatorClass.newInstance ();
try {
attrValidator.validate (classesToValidate);
} catch (ValidationException ve) {
throw new BuildException (ve.getInvalidClass () + " failed to validate: " + ve.getMessage ());
}
}
} finally {
cl.cleanup ();
}
} catch (BuildException be) {
throw be;
} catch (Exception e) {
e.printStackTrace ();
throw new BuildException (e.toString ());
}
}
}
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